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Sequoia 680 Chesapeake Drive Redwood City CA 94063 {415} 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord,CA 94520 {51.0} 686 9600 FAX{510}686 9689 <br /> 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (9l6} 921 9600 FAX{9l6}921 0100 <br /> �O Analytical <br /> %PDS Services Client Fira`ect ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> J <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedlsslan QC Sample Group 4120716-21 Reported Dec 21, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst A Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 4120825 4120825 4120825 4120825 <br /> Date Prepared 12/19/94 12/19/94 12/19/94 12/19/94 <br /> Date Analyzed 12/19/94 12/19/94 12/19/94 12/19/94 <br /> Instrument l D#. HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20ug/L 20 frg/L 20ug/L 60 frg/L <br /> Matrix Spike <br /> °/a Recovery 85 90 90 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 85 90 90 90 <br /> Relative% <br /> Difference 0 0 0 0 0 0 0 0 <br /> LCS Batch# 2LCS121994 2LCS121994 2LCS121994 2LC5121994 <br /> Date Prepared 12/19/94 12/19/94 12/19/94 12/19/94 <br /> Date Analyzed 12/19/94 12/19/94 12/19/94 12/19/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS% <br /> Recovery 80 87 89 89 <br /> % ecovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> Signature <br /> EQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recoverV is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 4120716 MPD <3> <br />